4617721 has 4 divisors (see below), whose sum is σ = 4622692. Its totient is φ = 4612752.

The previous prime is 4617713. The next prime is 4617737. The reversal of 4617721 is 1277164.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 1590121 = 1740^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 4617721 - 2³ = 4617713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4617721.

It is not an unprimeable number, because it can be changed into a prime (4617521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630 + ... + 3103.

It is an arithmetic number, because the mean of its divisors is an integer number (1155673).

Almost surely, 2^4617721 is an apocalyptic number.

It is an amenable number.

4617721 is a deficient number, since it is larger than the sum of its proper divisors (4971).

4617721 is a wasteful number, since it uses less digits than its factorization.

4617721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4970.

The product of its digits is 2352, while the sum is 28.

The square root of 4617721 is about 2148.8883172469. Note that the first 3 decimals coincide. The cubic root of 4617721 is about 166.5236404072.

The spelling of 4617721 in words is "four million, six hundred seventeen thousand, seven hundred twenty-one".